C++ (Cpp) _libelf_host_byteorderの例

コード例 #1

ファイル: libelf_phdr.c プロジェクト: Bhudipta/minix

void *
_libelf_getphdr(Elf *e, int ec)
{
	size_t phnum;
	size_t fsz, msz;
	uint64_t phoff;
	Elf32_Ehdr *eh32;
	Elf64_Ehdr *eh64;
	void *ehdr, *phdr;
	void (*xlator)(char *_d, char *_s, size_t _c, int _swap);

	assert(ec == ELFCLASS32 || ec == ELFCLASS64);

	if (e == NULL) {
		LIBELF_SET_ERROR(ARGUMENT, 0);
		return (NULL);
	}

	if ((phdr = (ec == ELFCLASS32 ?
		 (void *) e->e_u.e_elf.e_phdr.e_phdr32 :
		 (void *) e->e_u.e_elf.e_phdr.e_phdr64)) != NULL)
		return (phdr);

	/*
	 * Check the PHDR related fields in the EHDR for sanity.
	 */

	if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
		return (NULL);

	phnum = e->e_u.e_elf.e_nphdr;

	if (ec == ELFCLASS32) {
		eh32      = (Elf32_Ehdr *) ehdr;
		phoff     = (uint64_t) eh32->e_phoff;
	} else {
		eh64      = (Elf64_Ehdr *) ehdr;
		phoff     = (uint64_t) eh64->e_phoff;
	}

	fsz = gelf_fsize(e, ELF_T_PHDR, phnum, e->e_version);

	assert(fsz > 0);

	if ((uint64_t) e->e_rawsize < (phoff + fsz)) {
		LIBELF_SET_ERROR(HEADER, 0);
		return (NULL);
	}

	msz = _libelf_msize(ELF_T_PHDR, ec, EV_CURRENT);

	assert(msz > 0);

	if ((phdr = calloc(phnum, msz)) == NULL) {
		LIBELF_SET_ERROR(RESOURCE, 0);
		return (NULL);
	}

	if (ec == ELFCLASS32)
		e->e_u.e_elf.e_phdr.e_phdr32 = phdr;
	else
		e->e_u.e_elf.e_phdr.e_phdr64 = phdr;


	xlator = _libelf_get_translator(ELF_T_PHDR, ELF_TOMEMORY, ec);
	(*xlator)(phdr, e->e_rawfile + phoff, phnum,
	    e->e_byteorder != _libelf_host_byteorder());

	return (phdr);
}

コード例 #2

Elf_Data *
elf_getdata(Elf_Scn *s, Elf_Data *d)
{
	Elf *e;
	size_t fsz, msz, count;
	int elfclass, elftype;
	unsigned int sh_type;
	uint64_t sh_align, sh_offset, sh_size;
	void (*xlate)(char *_d, char *_s, size_t _c, int _swap);

	if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF ||
	    (d != NULL && s != d->d_scn)) {
		LIBELF_SET_ERROR(ARGUMENT, 0);
		return (NULL);
	}

	if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL)
		return (d);

	if (d != NULL)
		return (STAILQ_NEXT(d, d_next));

	if (e->e_rawfile == NULL) {
		LIBELF_SET_ERROR(SEQUENCE, 0);
		return (NULL);
	}

	elfclass = e->e_class;

	assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64);

	if (elfclass == ELFCLASS32) {
		sh_type   = s->s_shdr.s_shdr32.sh_type;
		sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset;
		sh_size   = (uint64_t) s->s_shdr.s_shdr32.sh_size;
		sh_align  = (uint64_t) s->s_shdr.s_shdr32.sh_addralign;
	} else {
		sh_type   = s->s_shdr.s_shdr64.sh_type;
		sh_offset = s->s_shdr.s_shdr64.sh_offset;
		sh_size   = s->s_shdr.s_shdr64.sh_size;
		sh_align  = s->s_shdr.s_shdr64.sh_addralign;
	}

	if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST ||
	    elftype > ELF_T_LAST || (sh_type != SHT_NOBITS &&
	    sh_offset + sh_size > (uint64_t) e->e_rawsize)) {
		LIBELF_SET_ERROR(SECTION, 0);
		return (NULL);
	}

	if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)(elftype,
		 (size_t) 1, e->e_version)) == 0) {
		LIBELF_SET_ERROR(UNIMPL, 0);
		return (NULL);
	}


	if (sh_size % fsz) {
		LIBELF_SET_ERROR(SECTION, 0);
		return (NULL);
	}

	count = sh_size / fsz;

	msz = _libelf_msize(elftype, elfclass, e->e_version);

	assert(msz > 0);

	if ((d = _libelf_allocate_data(s)) == NULL)
		return (NULL);

	d->d_buf     = NULL;
	d->d_off     = 0;
	d->d_align   = sh_align;
	d->d_size    = msz * count;
	d->d_type    = elftype;
	d->d_version = e->e_version;

	if (sh_type == SHT_NOBITS)
		return (d);

	d->d_flags  |= LIBELF_F_MALLOCED;

	if ((d->d_buf = malloc(msz*count)) == NULL) {
		(void) _libelf_release_data(d);
		LIBELF_SET_ERROR(RESOURCE, 0);
		return (NULL);
	}

	STAILQ_INSERT_TAIL(&s->s_data, d, d_next);

	xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass);
	(*xlate)(d->d_buf, e->e_rawfile + sh_offset, count, e->e_byteorder !=
	    _libelf_host_byteorder());

	return (d);
}